Flattened-strand rope.



0. TANGRING.

FLATTENED STRAND ROPE.

APPLICATION FILED DEG.3, 1910.

- Patentad Sept. 26, 1911.

WITN S SE5 dM UNITED STATES PA'IENT OFFICE.

OLOF TANGRING, OF WORCESTER, MASSACHUSETTS, ASSIGNO R TO THE AMERICAN STEEL & WIRE COMPANY OF NEW JERSEY, OF PITTSBURG, PENNSYLVANIA, A COR- PORATION OF NEW JERSEY'.

FLATTENED-STRAND ROPE.

Specification of Letters Patent.

Patented Sept. 26, 1911.

To all whom it may concern:

Be it known that I, OLOF TANGRING, of Worcester, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Flattened-Strand Rope, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing, forming part ofthis s ecification.

y invention relates to attened strand wire ropes or cables which are used .principally for haulage purposes. The ropes when so used are subject to great wear and rapidly lose their strength on account of the construction and shape of the cores used in forming the series of flattened strands comprising such ropes or cables, although owing to the flattened shape of the strand a greater number of wires are subjected to wear than is the case where the strands are circular in cross section. Heretofore, in such flattened strand wire ro es, each strand is composed of a series 0 round or cylindrical wires surrounding a core formed of a wire of oblong or triangular cross section. It has also been proposed to form such flattened strands by assembling cylindrical outer wires around a core formed of cylindrical wires of greater diameter than the surrounding outside wires.

The object of this invention is to provide a flattened strand rope or cable having a core formed in such manner as to increase the flexibility and thereby lengthen the life of the so formed rope by preventing breakage of the cores in the flattened strands and to greatly increase the strength of the strands from'which the cables and ropes are formed.

The invention consists in forming a spirally twisted strand composed of a core formed of a plurality of round or cylindrical wires having a diameter at most not greater than the surrounding outer or strand wires, laid side by side so that the maj o1- axis of the flattened strand corresponds with and intersects the axial center of each core wire at ail points in the length of the strand, and in laying a series of such strands s irally into a rope or cable.

. Referrm to the drawings, Figure 1 is a plan of a piece of flattened wire rope strand constructed and arranged in accordance with my, invention. Fig. 2 is a transverse section of the strand shown in Fig. 1. Fig. 3 1s a plan showing a wire rope or cable formedof a series of the flattened strands shown-in Figs. 1 and 2. Fig. 4 is a tran'sverse section of the rope or cable shown inFi . of tarred hemp or Manila rope and as shown in the drawing, five'of the strands are employed to form the rope or cable.

By reference to Fig. 2 it will be seen that the core wires 2 are of substantially smaller diameter than the surrounding outside or strand wires 3, this construction affording greater flexibility to the strands and increasing .the life of the rope formed of such strands by reason of the greater flexibility of the core, and the prevention of breakage of the core into small pieces within a short time afterbeing put-into use, as is the result .with such ropes when made with a single-oblong or triangular core.

The advantages of my invention arise from the employment in forming the ropes or cableslof flattened strands, in which the strands have a core formed of a plurality of cylindrical or round wires of a smaller or at most not greater diameter than the surrounding wires, and in laying the core wires side by side in such manner that the major axis of the flat strand corresponds to and coincides with the axial center of the core wires, instead of, as heretofore, using a single oblong or specially shaped core wireand to such an extent as to be ignored ,in I

figuring the strength of such flattened strand ropes. I

I claim 1. In a wire rope or cable, a flattened strand having a flattened core, said core being formed of a plurality of cylindrical core wires arranged slde by side in a single plane flattened core, said strand wires being larger in diameter than the wires forming the core, the wiresforming the strand being spirally twisted.

3. In a wire rope or cable, a flattened strand having a flattened core, said core being formed of a'plurality of cylindrical core wires arranged side by side in a single plane and a series of strand wires surrounding the flattened core, said strand wires being -at least equal in diameter to the wires forming the core, the wires forming the strand being spirally twisted.

4. In a'wire rope or cable strand, a flattened 'core formed of at least three cylindrical wires arranged side by side in a single plane and a series of surrounding strand wires at least equal in diameter to the wires forming the flattened core, the core and strand wires being spirally twisted.

5. In a wire rope or cable strand, a flattened core composed of three wires arranged side by side and a series of surrounding strand wires of larger diameter than the wires forming the flattened core, the core and strand wires being spirally twisted.

6. A wire rope having a serles of spirally twisted flattened strands, said strands having flattened cores, the flattened cores being composed of three core wires arranged side by side, and a series of strand wires surrounding the flattened core, the diameter of the strand wires being greater than the diameter of the wires forming the core, the core and strand wires being spirally twisted.

In testimony whereof, I have hereunto set my hand.

. OLOF TANGRING. Witnesses:

A. F. BACKLIN, C. W. Homans. 

